If it wasn't for Xia An'an's brains, he might have been fooled by Zuo Yin.

Zuo Yin didn't intend to take credit, and she didn't even want to tell her about it. If Zhang Nana didn't tell her, Xia An'an would never have known that Zuo Yin had helped her, but now Zuo Yin said it was No purpose